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Old 10-31-2008, 11:25 AM
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Join Date: Jul 2007
Posts: 4
190e, will only idle with micdroswitch disconnected

My '92 190E 2.3 will only idle if I disconnect the throttle micro-switch. I then idles ~900-1000 RPM. I have replaced the IAC, fuel pressure regulator, fuel filter, OVP. I put on a salvage-yard MAF with no change.

Occassionaly, it will start idling much higher than the 900-1000 RPM stated above. When this happens, I reconnect the micro-switch and for a few hours, it runs absolutely perfect. Also occassionally, it won't run at all. It seems that something is stuck.

I have recently re-worked the AC with a rebuilt compressor and R134 (if this has any bearing on the problem).

Any help is appreciated. Because of this unpredictable intermittent behavior, I cannot rely on the car at all.

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